WO2007018179A1

WO2007018179A1 - Gas combustion type driving tool

Info

Publication number: WO2007018179A1
Application number: PCT/JP2006/315599
Authority: WO
Inventors: Jyunichi Tamura; Katsuhiko Murayama
Original assignee: Max Co., Ltd.
Priority date: 2005-08-09
Filing date: 2006-08-07
Publication date: 2007-02-15
Also published as: AU2006277367A1; EP1914041B1; NO20080686L; CA2618680A1; CN101242932A; US20090255973A1; CN101242932B; TWI419775B; JP2007044799A; US7762443B2; JP4930672B2; TW200726598A; EP1914041A1; EP1914041A4

Abstract

A gas combustion type driving tool, wherein a fastener is driven out from a nose part when a gas is explosively burned in a combustion chamber (5) to impulsively drive a hammering piston. A gas line (26) is installed between the combustion chamber (5) and a feed cylinder (21) storing a feed piston for reciprocatingly moving a feed claw (23) engageable with and disengageable from the connection fastener in a nail feed direction for feeding the feed claw to a nose part side and a retreating direction reverse to the nail feed direction. A check valve (31) having a restriction hole (33) is openably disposed in the intermediate part of the gas line (26). The check valve (31) is normally energized by a spring in the closing direction and openably operated against a spring force by a gas pressure from the combustion chamber.

Description

Specification

Gas fired driving tool

Technical field

The present invention relates to a combustion chamber that explosively burns a mixed gas obtained by stirring and mixing flammable gas and air, a striking piston 'cylinder mechanism driven by combustion gas pressure, and a striking piston. The present invention relates to a gas combustion type driving tool including a nose portion that slides and guides a combined driver to drive a fastener, and a feed piston and cylinder mechanism that feeds a fastener to the nose portion. The present invention relates to a fastener feeding mechanism that delays the retracting operation of the fastener.

Background art

[0002] In some types of gas-fired driving tools, combustible gas is injected into a combustion chamber sealed in the body, and a mixed gas of combustible gas and air is stirred and stirred in the combustion chamber. When the mixed gas is burned in the combustion chamber, high-pressure combustion gas is generated in the combustion chamber. This high-pressure combustion gas acts on the striking piston accommodated in the striking cylinder, so that the striking piston is shockedly driven in the striking cylinder. The nail supplied to the nose part below the body is driven into the steel plate or concrete by the driver coupled to the lower surface side of the striking piston. In such a combustion gas driven driving machine, a container such as a gas cylinder filled with a combustible gas is mounted in the tool, and a battery as a power source for igniting the combustible gas is mounted on the tool. Is possible. For this reason, it is possible to perform the driving operation of a nail or a pin without being restricted by a power supply source such as electric power or compressed air.

[0003] The gas combustion type driving tool is provided with a feed mechanism for sequentially feeding the connected fasteners housed in the magazine to the nose portion. As this feed mechanism, a connecting fastener formed by connecting a number of fasteners in a straight shape to a sheath-shaped magazine is accommodated, and the connecting fastener is constantly pressed to the nose portion side by a constant output panel to shoot the inside of the nose portion. It is known that immediately after the fastener supplied to the outlet is driven, the next fastener is supplied into the nose. [0004] However, since such a straight magazine has a small number of fasteners to be accommodated, it is required to attach a cylindrical magazine that can accommodate a coupled fastener obtained by winding a large number of fasteners in a coil shape. The

[0005] A feed piston / cylinder mechanism is generally used as a fastener feed mechanism in a cylindrical magazine. This is because a feed claw that is slidably accommodated in a feed cylinder is provided with a feed claw that engages and disengages a connecting fastener housed in a magazine, and the opposite direction to the nail feed direction that feeds the feed claw to the nose side. It is reciprocated in the retreat direction.

[0006] Therefore, a cylindrical magazine can be employed together with the above-described feed piston 'cylinder mechanism. In this case, it is considered that the feed piston of the feed piston / cylinder mechanism is reciprocated using the pressure of the combustion gas in the panel and the combustion chamber. The feed piston is fed by a panel, and the retreat operation is reciprocated by gas pressure.

[0007] However, in the configuration in which the combustion chamber and the feed cylinder are directly connected via the gas pipe, the combustion gas acts on both the striking piston and the feed piston (feed claw) almost simultaneously. At about the same time, the feed piston retracts and the fastener becomes unstable when driven. That is, since the feed piston stays at the feed position by the panel, the leading nail supplied into the nose portion is pressed by the feed claw, so that the posture is stabilized. It is preferable that the posture of the fastener is stable while the fastener is driven out by the driver. However, if the striking mechanism is activated by the pressure of the combustion gas and the driver is driven together with the striking piston to strike the fastener and the feed piston is retracted at the same time, the force holding the fastener is lost and its posture becomes unstable. Tsutsushima !, correct the zipper, and can't be surely driven in the posture! /.

[0008] Therefore, in the nailing machine disclosed in Japanese Utility Model Laid-open No. 05-072380, as a means for delaying the operation timing of the feed piston, a check valve is provided in front of the feed mechanism to maintain the gas pressure in front of the feed piston. The gas pipeline is controlled by an exhaust valve linked to the contact arm.

[0009] However, the above method requires an exhaust nozzle for releasing the check valve, and dust at the tip of the nose is likely to adhere, and the sealing performance of the valve in the environment It is difficult to secure this. Disclosure of the invention

[0010] One or more embodiments of the present invention provide a simple structure that reliably delays the return of the feed pawl (feed piston) without requiring a complicated valve mechanism or ensuring sealing performance. Provided is a fastener feed mechanism for a gas-fired driving tool capable of effectively preventing the friction between a screw and a fastener.

[0011] According to one or more embodiments of the present invention, a gas combustion type driving tool includes a combustion chamber that explosively burns a mixed gas obtained by stirring and mixing flammable gas and air; This high-pressure combustion gas is applied to the striking piston accommodated in the striking cylinder to drive the striking piston impactively in the striking cylinder, and the driver coupled to the lower surface side of this striking piston is slidably guided. And a nose portion for driving out the fastener, and a feed piston 'cylinder mechanism for reciprocating the feed claw for engaging and disengaging the connecting fastener stored in the magazine in the nail feed direction to the nose portion side and the retreat direction opposite thereto. Is provided. A panel is provided at one end of the feed cylinder of the feed piston 'cylinder mechanism to constantly bias the feed piston provided with the feed pawl in the feed direction. A gas line is provided between the combustion chamber and the other end of the feed cylinder. A check valve is provided in the middle of the gas pipe, and a throttle hole is formed in the check valve.

[0012] According to one or more embodiments of the present invention, instead of forming a throttle hole in the check valve, the feed cylinder may be opened to the atmosphere by a solenoid valve.

[0013] According to one or more embodiments of the present invention, a gas pipe is provided between the combustion chamber and the feed cylinder, and a check valve is provided in the middle of the gas pipe. Since the stop valve is configured to have a throttle hole, when the driving is completed, the temperature in the combustion chamber rapidly decreases, so the space above the striking piston becomes negative pressure, and the striking piston returns. Similarly, the gas sent to the feed cylinder will also return to the combustion chamber. Gas will return through the throttle hole in the center of the check valve, so it will take time to pass, and the feed cylinder will immediately Not decompressed. The pressure is gradually reduced. For this reason, the fastener feed operation of the feed piston is delayed, and after the driver returns to top dead center and the nose part also moves backward, it moves in the fastener feed direction by the panel force, and a new leading fastener is Supplied to the nose section. Therefore, when the striking piston operates to feed the fastener, isn't the next nail slid to the driver? Therefore, the striking piston can surely return to the top dead center.

[0014] Since the check valve is provided in the gas pipe line, it is possible to ensure sufficient sealing performance even in an environment where dust or the like is likely to adhere.

[0015] As described above, the return of the feed claw (feed piston) is surely delayed with a simple structure without requiring a complicated valve mechanism or ensuring sealing performance, and the driver and the fastener are slid. It can be effectively prevented.

[0016] It is to be noted that the gas pressure of the combustion chamber force is supplied after pushing the check valve open at the time of driving, and the feed piston is retracted after waiting for sufficient pressure increase. Therefore, since the fastener is pressed against the inner wall of the nose portion when it is driven and the posture is stable, the fastener can be driven out reliably.

[0017] Further, according to one or more embodiments of the present invention, by using a solenoid valve, the timing of return of the feed claw (feed piston) can be freely adjusted according to the environmental temperature at high temperature or low temperature. Therefore, it is possible to reliably prevent the driver and the fastener from sliding.

[0018] Other features and advantages will be apparent from the description of the examples and the appended claims.

Brief Description of Drawings

FIG. 1 is a longitudinal sectional view showing a main part of a gas combustion type nailer when not operating.

FIG. 2 is a longitudinal sectional view taken along line XX in FIG.

FIG. 3 is an enlarged view of a check valve portion.

FIG. 4 is a longitudinal sectional view showing a state at the start of driving of the nailing machine.

FIG. 5 is a longitudinal sectional view showing the state at the start of driving in the same section as FIG. 2.

FIG. 6 is a longitudinal sectional view showing a state immediately after driving.

FIG. 7 (a) is an explanatory view of a feed piston / cylinder mechanism.

FIG. 7 (b) is an explanatory view of a feed piston / cylinder mechanism.

[FIG. 8 (a)] FIG. 8 (a) is an operation explanatory view of a gas combustion type driving tool according to a second typical embodiment.

[FIG. 8 (b)] is an operation explanatory view of a gas combustion type driving tool according to a second typical embodiment. Explanation of symbols

[0020] 5 Combustion chamber

7 Feed piston 'cylinder mechanism

26 Gas pipeline

31 Check valve

33 Diaphragm hole

34 Solenoid valve

BEST MODE FOR CARRYING OUT THE INVENTION

[0021] Hereinafter, typical embodiments of the present invention will be described with reference to the drawings.

[0022] A gas fired nailing machine as an example of a gas fired driving tool according to a first exemplary embodiment of the present invention will be described with reference to Figs. 1 to 7 (a).

In FIGS. 1 and 2, reference numeral 1 indicates the body of a gas combustion nailer. The body 1 is provided with a grip 2 and a magazine 3, and is provided with a striking piston 'cylinder mechanism 4, a combustion chamber 5, a nose portion 6, and a feed piston for a nail feed' cylinder mechanism 7. Yes.

The striking piston / cylinder mechanism 4 includes a striking piston 10 slidably accommodated in a striking cylinder 9 and a driver 11 integrally coupled to the bottom of the striking piston 10.

The combustion chamber 5 includes an upper end surface of the impact piston 10, an impact cylinder 9, an upper wall (cylinder head) 13 formed inside the upper housing 12, and an annular movable sleeve 14 disposed therebetween. The closed combustion chamber 5 is formed by moving the movable sleeve 14 upward, and the upper portion of the combustion chamber 5 is configured to communicate with the atmosphere by moving downward.

The movable sleeve 14 is linked to the contact arm 15 via the link member 19. The link member 19 is formed by extending a link portion 19b from the end of the bowl-shaped bottom portion 19a disposed below the striking cylinder 9 along the outer periphery of the striking cylinder 9, and the upper end of the link portion 19b is Connected to the movable sleeve 14, the bowl-shaped bottom portion 19 a is urged downward by a panel 8 provided between the bottom surface of the striking cylinder 9. The contact arm 15 is slidable up and down along the nose portion 6, and its lower end 15 a protrudes from the nose portion 6, 6 and the lower end 15a are pressed against the material P to be driven, so that they move upward relative to the nose 6. The lower surface of the bowl-shaped bottom portion 19 a of the link member 19 is engaged with the upper end 15 b of the contact arm 15.

[0026] The upper housing 12 is provided with an injection nozzle 17 communicating with the gas container, and an ignition plug 18 for igniting and burning the mixed gas. In addition, the upper housing 12 rotates to generate a mixed gas having a predetermined air-fuel ratio in the combustion chamber 5 by stirring the combustible gas injected into the combustion chamber 5 with the air in the combustion chamber 5. Fan 20 is provided.

[0027] The nose portion 6 guides the sliding of the driver 11 and opens to the magazine 3

[0028] As shown in FIGS. 7 (a) and 7 (b), the feed piston / cylinder mechanism 7 connects a feed claw 23 to a feed piston 22 slidably accommodated in a feed cylinder 21. Then, the feed claw 23 together with the feed piston 22 is engaged with and disengaged from the connecting nail N stored in the magazine 3, and is reciprocated in the nail feed direction to the nose portion 6 side and the retreat direction opposite thereto. When the feed piston 22 moves to the moving end in the feed direction, the leading nail N1 of the connecting nail N is pushed into the outlet 24 of the nose portion 6. Therefore, when the feed piston 22 is at the moving end position in the feed direction, the connecting nail N also does not move, so that the leading nail N1 is held in the injection port 24.

[0029] Next, the feed cylinder 21 of the feed piston 'cylinder mechanism 7 is provided with a panel 25 that constantly biases the feed piston 22 in the feed direction. On the other hand, an opening is formed on the feed cylinder 21 on the side opposite to the panel 25, and the opening and the combustion chamber are connected via a gas pipe 26.

[0030] Then, a valve port 30 is formed in the middle of the gas pipe 26 as described in detail in FIG. 3, and a check valve 31 is disposed therein. When the check valve 31 is urged by the panel 32 to move to the combustion chamber side and close the valve port 30 and is operated against the panel 32 by the gas pressure from the combustion chamber 5, The valve 30 is configured to open.

In addition, a small-diameter throttle hole 33 is formed at the center of the check valve 31 as an exhaust mechanism that exhausts the gas supplied into the feed cylinder and discharges the feed cylinder force.

Next, the operation mode of the operation delay mechanism will be described. First, in driving the nail, as shown in FIGS. 4 and 5, the nose portion 6 is strongly pressed against the material P to be driven, By moving the contact arm 15 relatively upward, the movable sleeve 14 also moves upward to form a sealed combustion chamber 5, and a combustible gas is injected into the combustion chamber 5 from the injection nozzle 17. The rotating fan 20 rotates and stirs and mixes the combustible gas and air. Next, when the trigger 16 is pulled, the spark plug 18 ignites the mixed gas, and the mixed gas burns and expands explosively. The pressure of this combustion gas acts on the upper surface of the striking piston 10 and drives it downward, so that the driver 11 hits the leading nail N1 supplied in the injection port 24 of the nose 6 and the driven material P Fj into.

[0033] At the same time, since the combustion gas in the combustion chamber 5 passes through the gas pipe 26, the check valve 31 is pushed out against the panel 32 by the gas pressure at that time, the valve port 30 is opened, and the gas further flows here. And the feed piston 22 moves in the retracting direction.

That is, the supply of gas pressure from the combustion chamber 5 to the feed cylinder 21 is performed after the check valve 31 closed by the panel 32 is pushed open, and the pressure is sufficiently increased to retract the feed piston 22. After that, the feed piston 22 is retracted. Therefore, the evacuation operation can be delayed by the time required to reach a sufficient boost.

[0035] In this manner, the striking piston 10 is driven to operate with combustion in the combustion chamber 5, and then the feed piston 22 is retracted. Therefore, the leading operation in the nose portion 6 is performed by the driving operation of the striking piston 10. Until the nail N1 is struck by the driver 11, the feed claw 23 of the feed piston 22 does not operate, so the top nail is pushed into the injection port 24 of the nose 6 and the posture is stable. Therefore, it can be launched correctly and reliably.

[0036] When the driving is completed, the temperature in the combustion chamber 5 rapidly decreases, so that the space above the striking piston 10 that has expanded to the striking cylinder 9 becomes negative pressure, which is caused by the pressure difference from the atmospheric pressure from below. Thus, as shown in FIG. 6, the striking piston 10 returns to the top dead center. Similarly, since the gas sent to the feed cylinder 21 also tries to return to the combustion chamber 5, the check valve 31 is closed and operated by the panel 32. For this reason, the gas returns through the throttle hole 33 in the center of the check valve 31. Since it takes time to pass through the throttle hole 33, the feed cylinder 21 is not immediately depressurized. The pressure is gradually reduced. For this reason, the nail feed operation of the feed piston 22 is delayed, and after the driver 11 returns to the top dead center and retreats from the nose portion 6, as shown in FIG. Move back and start new Nails are fed into the nose 6. Therefore, when the striking piston 10 returns, the next nail does not slide on the driver 11, so that the striking piston can surely return to the top dead center.

[0037] Since the pressure of the combustion gas combusted in the combustion chamber 5 (at the top of the driving piston) is sent from the gas pipe 26 to the feed piston / cylinder mechanism, a sufficiently high pressure can be supplied.

FIG. 8 (a) and FIG. 8 (b) show the main part of the second exemplary embodiment of the present invention.

In FIG. 8 (a), instead of forming a throttle hole in the check valve 31, the gas supplied into the feed cylinder is sent between the check valve 31 and the feed cylinder 21 in the gas pipeline 26. A configuration in which a solenoid valve 34 is arranged as an exhaust mechanism that also discharges cylinder force is shown. The solenoid valve 34 is set to open after the check valve 31 is closed after the driving is completed. According to the above configuration in which the feed cylinder 21 is opened to the atmosphere by the solenoid valve 34, the gas pressure supplied from the combustion chamber 5 to the feed cylinder 21 is reversed as shown in the above diagram when driving. This is performed after the stop valve 31 is pushed open, and the feed piston 22 (feed claw 23) is retracted, so that the leading nail is pushed into the injection port 24 of the nose 6 and the posture becomes stable. However, it can be launched reliably in a posture.

[0039] When the driving is completed, the temperature in the combustion chamber rapidly decreases, and the striking piston returns to the top dead center. Similarly, since the gas sent to the feed cylinder 21 also tries to return to the combustion chamber, the check valve 31 is closed and operated by the panel 32. After the driver 11 returns to top dead center and retreats from the nose 6, the solenoid valve 34 opens as shown in Fig. 8 (b), and the compressed air in the feed cylinder is exhausted. It moves back in the nail feed direction due to the force of and the new leading nail is fed into the nose 6. Therefore, when the striking piston returns, the next nail does not slide on the driver 11, so that the striking piston can surely return to the top dead center.

[0040] As described above, the use of the solenoid valve 34 allows the return timing of the feed claw (feed piston) to be freely delayed according to the environmental temperature at high and low temperatures. Can be reliably prevented.

[0041] The driving tool according to the present invention is not limited to a nail driver. Power comes from combustion It can be applied to driving tools that send fasteners such as transmitted and connected headed bars (nails, screws) and headless bars (parallel pins).

[0042] Although the invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. is there.

[0043] This application is based on a Japanese patent application filed on August 9, 2005 (Japanese Patent Application No. 2005-231116), the contents of which are incorporated herein by reference.

Industrial applicability

[0044] The present invention relates to a combustion chamber that explosively burns a mixed gas obtained by stirring and mixing flammable gas and air, a striking piston 'cylinder mechanism driven by combustion gas pressure, and a striking piston. The present invention can be used for a gas combustion type driving tool including a nose portion that slides and guides a coupled driver to drive a fastener, and a feed piston and cylinder mechanism that sends a fastener to the nose portion.

Claims

The scope of the claims

A combustion chamber;

A striking cylinder;

A striking piston housed in the striking cylinder and driven by a high-pressure combustion gas; a driver coupled to the striking piston and striking a fastener;

A nose portion for slidingly guiding the driver;

A feed piston 'cylinder mechanism that reciprocates a feed claw that engages and disengages with a connecting fastener housed in a magazine to the nose portion side and a retreat direction opposite to the feed direction, and a feed cylinder of the feed piston' cylinder mechanism. A panel which is provided at one end and constantly urges the feed piston provided with the feed pawl in the feed direction;

A gas line connecting the combustion chamber and the other end of the feed cylinder;

A check valve provided in the gas pipeline;

An exhaust mechanism for discharging the gas supplied into the feed cylinder to discharge the feed cylinder force, and a gas combustion type driving tool.

2. The gas combustion type driving tool according to claim 1, wherein the exhaust mechanism includes a throttle hole provided in the check valve.

The gas in the feed cylinder is returned to the combustion chamber side through the throttle hole in a state where the check valve is closed, and the pressure in the feed cylinder is gradually reduced. Gas burning type driving tool.

The exhaust mechanism includes a solenoid valve,

The feed cylinder is opened to the atmosphere by the solenoid valve;

The gas combustion type driving tool according to claim 1.

The solenoid valve opens after the driver returns to top dead center

The gas combustion type driving tool according to claim 4.